Blast-furnace hearth.



No. 729,105. I PATENTED MAY 26,1903. M. M. SUPPES.

BLAST FURNACE HEARTH.

APPLICATION FILED JAN. 22, 1903.

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' PATENTED MAY 26, 1903.v

M. M. SUPPES. BLAST FURNACE HEARTH.

APPLICATION I'ILED JAN. 22, 1903.

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PATENT OFFICE.

BLAST-FURNACE HEARTH.

SPEGIFIGATION forming part of Letters Patent No. 729,105, dated May 26,1903.

Application filed January 22, 1903. Serial No. 140,137- (No model.)

To all whom it may concern:

Be it known that I, MAXIMILIAN ll/LSUPPES, of Elyria, in the county ofLorain and State of Ohio, have invented a new and useful Improvement inBlast-Furnace Hearths, of which the following is a full, clear, andexact description, reference being had to the accompanying drawings,which form a part of this specification.

My invention has relation to certain new and useful improvements inblast-furnaces, and more particularly to an improved construction of thehearth jacket and irontrough.

In the modern blast-furnace practice much care and attention havenecessarily been given to the con struction of the furnace-hearth toenable it to stand the severe conditions to which itis subjected, andvarious forms of hearth-jackets have been devised. Some of these havepromised good results and would, in fact, have proven satisfactory inservice but for the fact that they have all contained one particularlyweak point which has sooner or later given trouble. This weak point isthe point of connection between that section or portion of the jacket inwhich is formed the iron-tap hole and the iron-trough, through which themetal runs from the furnace in tapping. This weakness has been duepartly to the fact that the trough has been made in a separate pieceheld or secured to the jacket in various ways, but in every casepresenting some form of a joint between the parts. This joint issooneror later found by the hot metal, which soon cuts its waytherethrough, to the serious injury of the jacket and of thefurnace-base. The hot metal also constantly tends to cut away the bottomof the iron notch, and frequently does this to such an extent that itcomes directly in contact with the jacket at and below the bottom of thetrough and proceeds to cut its way out through the jacket or around thetrough. Injuries to the furnace caused in these ways are difficult andexpensive to repair, since they require either the renewal of one ormore sections of the jacket or an attempt to patch up the old sec tions,which is apt to be unsatisfactory by leaving a weak place in the jacket.

The object of my invention is to obviate these difficulties by providinga construction in which the weak point is entirely eliminated. Thisresult I attain by forming the trough integrally with the section of thehearth-jacket having the tap-hole therein, thereby obviating the use ofany form of joint at this point. This, however, might not in all casesof itself form a satisfactory solution of the difficulty, since unlessmeans are provided whereby the trough may be effectively protected fromthe destructive action of the hot metal flowing through it it would soonburn out, and this would make necessary the frequent renewal of theentire jacket-section.

My invention therefore further consists in so constructing and arrangingthe trough that it is protected from destruction in a highly effectivemanner.

I also provide means whereby the hot metal in or coming from the furnacecannot by reason of the cutting away of the bottom of the iron notchbreak through the jacket below the trough.

My invention also consists in the novel construction, combination, andarrangement of parts, all substantially as hereinafter described, andpointed out in the appended claims, reference being had to theaccompanying drawings, in which I Figure 1 is a vertical section of thelower portion of a blast-furnace embodying my invention, the sectionbeing taken through the center of the iron notch. Fig. 2 is a plan viewof a portion of the furnace-hearth; Fig. 3, a central vertical sectionthrough the jacketplate and trough, and Fig. 4: is a front elevation ofthe same.

The letter A designates the hearth-jacket, and B the hearth-lining, of ablast-furnace, which in general is of any suitable type of construction.The jacket A is built up of a number of segments or sections, which arebolted together in the usual manner. These segments or sections arepreferably steel castings. In the section A is formed the tap-hole O,and formed integrally with said section is the eXteriorly-projectingiron-trough D. D designates the refractorylining of this trough, whichis continued through the tap-hole C and joins the hearth-lining B. Thetrough may be of any desired length, but is preferably in all cases longenough to-extend across the water-well F at the base of the furnace, sothat if any metal should escape at the joint between the trough and therunner it will not get into the well and will be far enough away fromthe hearth and base of the furnace to avoid any injury thereto. Thisalso permits the trough to be surrounded by the water in the well, afeature not heretofore possible on account of the danger of metalgetting out into the well. The trough is made of such depth that itsbottom is considerably below the bottom of the tap-hole.

This is an important feature, since it permits.

the lining D to be made deep enough to extend below any point to whichthere is liability of the hot metal cutting its way through-that is tosay, the hot metal may work its way down by cutting away the bottom ofthe iron notch to the lower edge of the tap-hole and may cut away thelatter to a considerable distance without being able to get out throughthe jacket below the trough. This deep lining also protects the troughand may be permitted to cut away to a considerable extent without anydanger of the trough being injured. The trough is also Wide enough topermit a thick lining at the sides 'as-well as at the bottom. .Thetrough being thus protected inleriorly by the deep lining and exteriorlyby the water is rendered as durable as the jacket itself.

The water-well F may, if desired, be made to extend underneath thetrough as well as at the sides thereof. This is shown in Fig. 3.

I do not limit myself to the precise construction and arrangement whichI have herein shown and described, but may make such modificationstherein as are fairly included in the scope of my invention as set forthin the following claims.

Having thus'descrlbed my invention, what Iclaitn as new, and desire tosecure by Letters Patent, is-

1. In a blast-furnace hearth, a metallic hearth-jacket plate or sectionhaving a taphole therein, and formed with an integral iron trough orspout into which the hot metal is discharged by the said hole.

2. In a blast-furnace hearth, a metallic hearth-jacket plate or sectionhaving a taphole thereon, and formed with an integral iron trough orspout, and a deep refractory lining for said trough or spout extendingthrough the tap-hole and joining the hearth-lining.

3. In a blast-furnace hearth, a metallic hearth-jacket plate or sectionhaving a taphole therein, and a trough or spout integrally 'joined tothe plate or section and of such depth that its bottom is below thebottom of the iron notch.-

at. In a blast-furnace hearth, a jacket plate or section having atap-hole and an integral trough or spout surrounding said hole, and arefractory lining for said trough ofsuch depth and thickness as toextend considerably below and laterally of the edges of said hole.

5. In a blast-furnace hearth,a water space or well surrounding thehearth, a hearth-jacket plate or section having a tapho1e therein, and atrough or spout integrally joined to said plate or section and extendingacross the said water space or well.

6. In a blast-furnace hearth, a jacket plate or section having anintegral trough adjacent to the tap-hole, and a Water-space adjacent tothe said trough.

'7. In a blast-furnace hearth, a jacket plate or section formed with atrough integral therewith and with a tap-hole which discharges into saidtrough, and a refractory lining for the trough extending below thebottom of the tap-hole.

8. In a blast-furnace hearth, a jacket plate or section having a troughor spout formed integrally therewith, a thick refractory lining for saidtrough, and a waterspace around the exterior of the trough.

In testimony whereof I have affixed my signature in presence of twowitnesses.

MAXIMILIAN M. SUPPES.

Witnesses:

S. W. VAUGHEN, D. W. LAWRENCE.

